干馏终温对油砂油化学结构的影响

引言随着全球石油资源的日益短缺和石油需求的不断增加,油砂作为非常规油气资源中的一种,因其储量丰富、开采成本不断降低而越来越受到资源需求者的极大关注。世界上有70多个国家蕴藏油砂资源,主要油砂资源国有加拿大、俄罗斯、委内瑞拉、尼日利亚和美国1]。据统计,全球油砂可采资源量约为891×108 t,占世界油气资源可采总量的32%2]。油砂又称沥青砂或焦油砂,是一种含有沥

Influence of retorting end temperature on chemical structure of oil-sand oil

Oil samples,obtained by retorting Indonesian oil sands at different end temperatures,were analyzed by ¹H nuclear magnetic resonance spectroscopy and elemental analyzer.Based on the assignments of hydrogen peaks,integrating each ¹H NMR peak can give hydrogen distribution in oil samples.The average structure parameters were calculated using modified Brown-Ladner method.The influence of retorting end temperature on chemical structure of the oil-sands oil could be revealed from an analysis for change tendency of structure parameters with retorting end temperature.The results showed that,with increasing end temperature,the chemical structure of oil-sands oil changed significantly,i.e.,the number of aliphatic carbons C_al,aromatic peripheral carbons C_p(us),aromatic carbons C_a(us),aromatic rings R_a(us),naphthenic rings R_n(us) and total rings R_t(us) all decreasing,mainly due to decomposition of alkanes,broken of alkyl side chains,condensation of aromatic and naphthenic rings and ring-opening.Owing to the different of oil constituents produced and that of influence degree of distillation-pyrolysis,average mass of unit structure and average relative molecular weight decrease first and then increase with rise of retorting end temperature.